Handdo 2Pcs CAT40-ER20 Collet Chuck 6" X-Long Gage Length Balanced to G2.5 at 25000RPM

CAT 40 Taper Shank; For ER-20 Collets. Balanced to G2.5 at 25000 RPM; Maintains low runout even at high spindle speeds. CAT40 V-Flange ER20 Collet Chucks. Gage Length: 6"----2 Pcs. Super high speed tool holders. 0.0001" Runout.